How to Store and Handle Synthesized Peptides

Peptides are generally shipped at room temperature and are usually most stable in lyophilized form when kept sealed and dry. For best long-term stability, they should not be kept in solution for long periods unless the application specifically requires it.

Core storage principles:

• Store peptides in lyophilized form for long-term stability
• Use sealed containers with desiccant whenever possible
• Avoid unnecessary exposure to moisture during opening and weighing
• Do not keep peptides in solution for long periods unless needed

Recommended Peptide Storage Guidelines

Lyophilized Storage

For long-term storage, peptides should be stored in lyophilized form at -20°C, or preferably at -80°C, with desiccant in sealed containers to minimize degradation.

Why Dry Storage Helps

Dry storage helps reduce bacterial degradation, oxidation, and unwanted structural changes that can occur more easily in solution.

Room Temperature Shipping

Peptides are commonly shipped at room temperature because they are generally stable in lyophilized form for transit, especially when protected from moisture.

Solution Is Less Stable

Once reconstituted, many peptides become more vulnerable to degradation, oxidation, or aggregation, so solution storage should be minimized when possible.

Before Opening the Package

It is better to equilibrate the peptide to room temperature, preferably in a desiccator, before opening or weighing. Peptides are often hygroscopic, and opening a cold vial too soon can allow condensation to form on the material, reducing stability.

Let the peptide warm to room temperature before opening. This simple step helps prevent condensation and unnecessary moisture exposure.

Before Reconstitution

Before reconstitution, centrifuge the vial of lyophilized peptide at about 12,000 g for around 20 seconds. This helps pellet the full peptide sample to the bottom of the vial and makes reconstitution more consistent.

During Weighing and Handling

Weigh out the required quantity rapidly and return unused peptide to cold storage promptly. Repeated exposure to room air, moisture, and repeated handling can reduce long-term stability.

Handling step	Practical recommendation
Before opening	Allow the vial to reach room temperature, ideally in a desiccator
Before reconstitution	Centrifuge briefly to collect the full sample at the bottom of the vial
During weighing	Work quickly and return unused material to cold storage
Long-term storage	Store lyophilized at -20°C or preferably -80°C with desiccant in sealed containers

Which Sequences Have Shorter Shelf Life?

Some peptide sequences are more sensitive than others. Sequences containing cysteine, methionine, tryptophan, asparagine, glutamine, and N-terminal glutamic acid may have shorter shelf life than more stable sequences, especially under less controlled storage conditions.

When storage needs extra care

Storage and handling become more important when the peptide is oxidation-sensitive, hygroscopic, repeatedly used, or likely to degrade more quickly in solution.

• Contains Cys, Met, Trp, Asn, or Gln: expect more careful storage needs
• Repeated use planned: consider aliquoting to reduce handling stress
• Long solution storage expected: review stability and reconstitution strategy first

Analyze your sequence to better understand handling sensitivity:

Related Topics

• Why Are Peptides Sealed?
• Why Aliquot Peptides?
• How to Aliquot Peptides
• How to Dissolve Peptides
• Full Peptide FAQ

Quotation

If you need help planning storage, aliquoting, or reconstitution for a specific peptide sequence, please email [email protected] or use our quotation form.